#!/usr/bin/python
# DSL - easy Display Setup for Laptops
+# Copyright (C) 2012 Ralf Jung <post@ralfj.de>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program (gpl.txt); if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-import sys, re, subprocess
+import os, sys, re, subprocess
from PyQt4 import QtGui
from selector_window import PositionSelection
app = QtGui.QApplication(sys.argv)
+# for auto-config: common names of internal connectors
+commonInternalConnectorNames = ['LVDS', 'LVDS1', 'LVDS-0']
+
+# Load a section-less config file: maps parameter names to space-separated lists of strings (with shell quotation)
+def loadConfigFile(file):
+ import shlex
+ result = {}
+ if not os.path.exists(file):
+ return result # no config file
+ # read config file
+ linenr = 0
+ with open(file) as file:
+ for line in file:
+ linenr += 1
+ line = line.strip()
+ if not len(line) or line.startswith("#"): continue # skip empty and comment lines
+ try:
+ # parse line
+ pos = line.index("=") # will raise exception when substring is not found
+ curKey = line[:pos].strip()
+ result[curKey] = shlex.split(line[pos+1:]) # shlex.split also strips
+ except Exception:
+ raise Exception("Invalid config, line %d: Error parsing line (quoting issue?)" % linenr)
+ # add some convencience get functions
+ return result
+
def getXrandrInformation():
p = subprocess.Popen(["xrandr", "-q"], stdout=subprocess.PIPE)
connectors = {} # map of connector names to a list of resolutions
connector = None # current connector
for line in p.stdout:
+ # ignore screens
+ if line.startswith("Screen"):
+ continue
# new connector?
- m = re.search(r'^([\w]+) connected ', line)
+ m = re.search(r'^([\w\-]+) (dis)?connected ', line)
if m is not None:
connector = m.groups()[0]
assert connector not in connectors
strRatio = '16:%d' % ratio
return '%dx%d (%s)' %(w, h, strRatio)
-# Check screen setup
-internalName = "LVDS1"
-externalNames = ["HDMI1", "DP1", "VGA1"]
+def findAvailableConnector(tryConnectors):
+ for connector in tryConnectors:
+ if connector in connectors and connectors[connector]: # if the connector exists and is active (i.e. there is a resolution)
+ return connector
+ return None
+
+# load connectors and options
connectors = getXrandrInformation()
-internalResolutions = connectors[internalName] # there must be a screen assoicated to the internal connector
-externalName = None # *the* external connector which is actually used
-externalResolutions = None # resultions of the external connector
-args = {} # maps connector names to xrand arguments
+config = loadConfigFile(os.getenv('HOME') + '/.dsl.conf')
+# find internal connector
+if 'internalConnector' in config:
+ if len(config['internalConnector']) != 1:
+ raise Exception("You must specify exactly one internal connector")
+ internalConnector = config['internalConnector'][0]
+ if not internalConnector in connectors:
+ raise Exception("Connector %s does not exist, there is an error in your config file" % internalConnector)
+else:
+ # auto-config
+ internalConnector = findAvailableConnector(commonInternalConnectorNames)
+ if internalConnector is None:
+ raise Exception("Could not automatically find internal connector, please use ~/.dsl.conf to specify it manually")
+# all the rest is external then, obviously - unless the user wants to do that manually
+if 'externalConnectors' in config:
+ externalConnectors = config['externalConnectors']
+ for connector in externalConnectors:
+ if not connector in connectors:
+ raise Exception("Connector %s does not exist, there is an error in your config file" % internalConnector)
+else:
+ externalConnectors = connectors.keys()
+ externalConnectors.remove(internalConnector)
+if not externalConnectors:
+ raise Exception("No external connector found - either your config is wrong, or your machine has only one connector")
-# look for enabled external screen, disable all the others
-for name in externalNames:
- if externalResolutions is None and name in connectors:
- externalName = name
- externalResolutions = connectors[name]
- else:
- args[name] = ["--off"]
+# default: screen off
+args = {} # maps connector names to xrand arguments
+for c in externalConnectors+[internalConnector]:
+ args[c] = ["--off"]
# Check what to do
-if externalName is not None: # we need to ask what to do
- extPosition = PositionSelection(externalName, map(res2user, internalResolutions), map(res2user, externalResolutions))
+usedExternalConnector = findAvailableConnector(externalConnectors) # *the* external connector which is actually used
+if usedExternalConnector is not None: # there's an external screen connected, we need to ask what to do
+ internalResolutions = connectors[internalConnector]
+ externalResolutions = connectors[usedExternalConnector]
+ extPosition = PositionSelection(usedExternalConnector, map(res2user, internalResolutions), map(res2user, externalResolutions))
extPosition.exec_()
if not extPosition.result(): sys.exit(1) # the user canceled
extResolution = res2xrandr(externalResolutions[extPosition.extResolutions.currentIndex()])
intResolution = res2xrandr(internalResolutions[extPosition.intResolutions.currentIndex()])
# build command-line
- args[externalName] = ["--mode", extResolution] # we definitely want an external screen
+ args[usedExternalConnector] = ["--mode", extResolution] # set external screen to desired resolution
if extPosition.extOnly.isChecked():
- args[internalName] = ["--off"]
- args[externalName] += ["--primary"]
+ args[usedExternalConnector] += ["--primary"]
else:
# there are two screens
- args[internalName] = ["--mode", intResolution]
+ args[internalConnector] = ["--mode", intResolution] # set internal screen to desired resolution
+ # set position
if extPosition.posLeft.isChecked():
- args[externalName] += ["--left-of", internalName]
+ args[usedExternalConnector] += ["--left-of", internalConnector]
else:
- args[externalName] += ["--right-of", internalName]
+ args[usedExternalConnector] += ["--right-of", internalConnector]
+ # set primary screen
if extPosition.primExt.isChecked():
- args[externalName] += ["--primary"]
+ args[usedExternalConnector] += ["--primary"]
else:
- args[internalName] += ["--primary"]
+ args[internalConnector] += ["--primary"]
else:
- args[internalName] = ["--mode", res2xrandr(internalResolutions[0]), "--primary"]
+ # use first resolution
+ args[internalConnector] = ["--mode", res2xrandr(connectors[internalConnector][0]), "--primary"]
# and do it
call = ["xrandr"]
for name in args:
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